One thing that comes to mind would be one of these funky keypad assemblies:
✓ cheap
✓ interesting
✓ apple
✓ stuff
I see them show up on ebay sometimes. I bought one from there about a year ago. Big blue saw was running a deal at the time so I got a big thick piece of aluminium cut to mount it on. I thought it would make a cool numpad for my work desk. Haven't done anything with it yet, though.
![Image](https://i.imgur.com/r4mE19z.jpg)